A standard Proctor test was conducted on a silty clay soil collected from a proposed construction site. The results are shown in the following table. (Gs = 2.7) Mass of moist soil Moisture Trial no. in the mold (g) content (%) 1 1689 12.7 1752 15.0 3 1800 17.8 4 1845 20.6 5 1844 23.8 Using the compaction test data determine the optimum moisture content and the maximum dry unit weight. Plot the zero-air-void curve and check whether it intersects the compaction curve. Plot the void ratio and the degree of saturation against the moisture content. What are the void ratio and degree of saturation at the optimum moisture content? If the specification calls for 95% DOC, What the is least acceptable field dry density? القطة شاشة

A standard Proctor test was conducted on a silty clay soil collected from a proposed construction site. The results are shown in the following table. (Gs = 2.7) Mass of moist soil Moisture Trial no. in the mold (g) content (%) 1 1689 12.7 1752 15.0 3 1800 17.8 4 1845 20.6 5 1844 23.8 Using the compaction test data determine the optimum moisture content and the maximum dry unit weight. Plot the zero-air-void curve and check whether it intersects the compaction curve. Plot the void ratio and the degree of saturation against the moisture content. What are the void ratio and degree of saturation at the optimum moisture content? If the specification calls for 95% DOC, What the is least acceptable field dry density? القطة شاشة

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Soil Compaction Test

Soil compaction is the major area of geotechnical engineering. Soil is composed of multiple pores present on its surface, while the soil is mainly composed of gravel, sand, rocks, etc. The arrangement of these rocks and gravels is such that they build up voids (spaces) between them, which allows spaces for the roots of the plants and crops to spread and absorb the required amount of nutrients. Soil compaction is a major problem primarily caused by human activities, micro-organisms, and other multiple factors.

Question

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Problem 1:
A standard Proctor test was conducted on a silty clay soil collected from a proposed construction site. The
results are shown in the following table. (Gs = 2.7)
Mass of moist soil
Moisture
Trial no.
in the mold (g)
content (%)
1
1689
12.7
2
1752
15.0
3
1800
17.8
4
1845
20.6
5
1844
23.8
Using the compaction test data determine the optimum moisture content and the maximum dry unit
weight.
Plot the zero-air-void curve and check whether it intersects the compaction curve.
Plot the void ratio and the degree of saturation against the moisture content.
What are the void ratio and degree of saturation at the optimum moisture content?
If the specification calls for 95% DOC, What the is least acceptable field dry density?
äi li ähöl

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The laboratory compaction test of a certain type of soil gives a maximum dry density of 1.486 g/cm3 with an optimum moisture content of 12.5%. The following are the results of a field unit weight determination test using sand cone method. Volume of the soil excavated from the hole = 0.001337 m3 Weight of soil from the hole when wet = 2220 g Weight of soil when dry = 1890 g What is the in situ water content of the soil? O 17.46% O 19.21% O 15.55% O 14.12%
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A modified Proctor compaction test was carried out using a cylindrical moldwith a 1000 ml volume. Table 2 summarizes the results.a. Plot the compaction and ZAV curves (RD=2.75 and ρwater=1000 kg/m3).b. Determine the maximum dry density and the optimum moisture content.
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Situation 5 : A sample of saturated clay was placed in a container and weighed. The weight was 6N. The clay in its container was placed in an oven dray for 24 hours @ 105℃. The weight reduced to a constant weight of 5N. The weight of the container is 1N. If Gs = 2.7, determine: a. Water content b. Void ratio c. Moist unit weight d. Dry unit weight f. Effective unit weight
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6. Following is the result of 8 trials of a standard proctor test. Determine the optimum water content and maximum dry unit weight. Determine also the amount of energy expended in the compaction of one of the trials assuming that the test done is standard proctor test. Proctor Mold Volume Mass of wet soil in the Moisture Content Trial (cm³) mold (kG) (%) 1 943.3 1.68 9.9 943.3 1.71 10.6 3 943.3 1.77 12.1 4 943.3 1,83 13.8 943.3 1.86 15.1 6 943.3 1.88 17.4 943.3 1.87 19.4 8 943.3 1.85 21.2
P1. Answer the question correctly
A modified Proctor compaction test was carried out using a cylindrical moldwith a 1000 ml volume. Table 2 summarizes the results. a. Plot the compaction and ZAV curves (RD=2.75 and ρwater=1000 kg/m3)b. Determine the maximum dry density and the optimum moisture content Table 2 Moisture Content (%)Mass of WetSample (g)10.5 2033.211.8 2146.613.0 2203.514.9 2183.116.4 2147.617.6 2116.8
Discuss your results and compare your results with any published data. For the bulk density test, obtain the value of dry density. How does the values of (i) void ratio (ii) porosity influenced your results? How will these values differ if the soil is fully saturated, partially saturated or submerged? Support your assertions using relevant phase relationship equations. Whatwill happen to the values of particle density (specific gravity) obtained if the soil sample contain large quantities of peat or organic material? How will the results be used in specific practical conditions in the construction industry? Explain any source(s) of error in your experiment and state how it affected your result.